In most relocations there is a visible move and an invisible one, and the invisible one belongs to the accompanying partner. The employed spouse imports structure, colleagues, and purpose; the partner often lands with no network, an interrupted career, and sometimes no legal right to work. That asymmetry is the most cited reason international moves fail, so verify the partner's work rights under the dependent visa before departure, and plan their professional and social re-entry as seriously as the job itself.
Children adjust on an age gradient. Younger ones absorb language and new schools quickly, while teenagers can grieve lost friendships hard, so involve them in decisions and time moves around school transitions.
Expect the family system itself to reorganize. Roles shift, financial dependence may reverse, and stress tends to peak a few months in when novelty fades for everyone simultaneously. Families that talk about this openly and give each member their own foothold, such as an activity or project, come through stronger rather than strained.